the fbi says now they believe they know who did it. >>> tonight, the extraordinary moment as two sandy hook parents came face-to-face with the father of killer adam lanza. >> i wanted to speak to him as one father to another father. >> emilie parker was 6 years old when she was murdered with 19 of her class mates. now her father joins me for an emotional interview. >> my daughter is beautiful and she is going to be great and she is going to continue to touch lives of countless numbers of people. >>> the former nra operative gets personal. >> we saved the british people because the americans had the guns. >> what he thinks of reducing gun violence in america. >>> also, where senators stand on the assault weapons ban. i'm demanding answers and tonight, we are giving it to you. >>> and a man on a mission. heartthrob and hollywood star gerard butler taking on the bad guys, working closely with navy s.e.a.l.s to make it happen. >> they are so dedicated and committed and passionate. it is amazing how their brains work. >>> good evening. there has been much debate about the gun violence destr